JP2545148B2 - Image data conversion method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] The present invention relates to an image data conversion method in the case of converting and transmitting image data, and for the purpose of converting the image data in real time, data transfer is performed by adding text data to the image data. When performing, prepare an image memory for storing one page of image data and a character font table for converting text data into dot data, and set the timing of command / response (transmission / reception signal transmission / reception) on the sending side and receiving side. Using the above, the one-page encoded image data is decoded and stored in the image memory, and the text data is converted into dot data by the character font table and superimposed on the image memory. Image data conversion To configure.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image data conversion method for converting and transmitting image data, and more specifically, information such as destination information and sender information is overlaid on the top of a page of facsimile data. The present invention relates to a method of converting image data (image data) when transmitting.

With the increasing use of facsimile communication services in recent years, with the diversification of requested services, facsimile / mail / sending of accumulated image data to specified destinations /
A device that realizes a broadcast service is required. For this reason, an image data storage device is provided, but text (TEXT) data such as sender information and destination information is overlaid on the stored image data,
Moreover, when the device capacity such as the pixel density of the destination terminal, the data compression method, and the paper size is not suitable and the conversion of the data according to the capacity of the terminal is necessary, the data is suitable because it cannot be processed in real time during communication. After converting to the format, you need to send again.

[Prior Art] FIG. 5 is an explanatory diagram of a conventional data conversion method. In the conventional image storage device, if the capability of the receiving terminal notified at the start of communication, the pixel density of the image data to be transmitted, the data compression method such as MH / MR, and the paper size do not match, use the following method. Image data is transferred.

That is, the image data encoded and accumulated in the one-page encoded image (before conversion) 1 is read line by line and decoded. The decoded 1 Iran-decoded image 2 is coded according to the capability of the partner terminal and converted into a 1-line coded image 3. The converted coded image for each line is transmitted as data.

FIG. 6 is a diagram showing a conventional data conversion processing start timing. First, DIS (identification signal) is transmitted from the receiving side to the transmitting side. (). Upon receiving this DIS, the transmission side confirms the terminal of the transmission destination and sends DCS (reception command signal) to the reception side (). Further, the receiving side sends a TCF (training check signal) to the receiving side (). Upon receiving this TCF, the receiving side returns a CFR (reception preparation confirmation signal) to the transmitting side ().

Upon receiving the CFR, the transmitting side performs data conversion as shown in FIG. 5 and starts sending (). As a result, the image data is sent from the transmitting side to the receiving side ().

[Problems to be Solved by the Invention] When text data is overlaid on image data by a conventional method, at least the number of lines for one character of text (for example, one character is converted to font data of 24 × 24 dots). In the case of 24 lines, in the case of 16 × 16 dots, 16 lines can be processed without decoding at once. That is, since the text data is code data, it needs to be converted into image data.

Therefore, even if text data is overlaid on image data and transmitted, real-time data conversion at the time of data transmission cannot be performed, and if the capability of the destination terminal does not match, there is a problem that the data cannot be transmitted.

The present invention has been made in view of the above problems, and an object thereof is to provide an image data conversion method capable of processing text overlay to an image and data conversion in real time during communication.

[Means for Solving the Problems] FIG. 1 is a flowchart showing the principle of the method of the present invention. The present invention prepares an image memory for storing one page of image data and a character font table for converting text data into dot data when data transfer is performed by adding text data to image data (step 1 ), By using the command / response timing of the transmitting side and the receiving side, the one-page encoded image data is decoded and stored in the image memory, and the text data is converted into dot data by the character font table and imaged. It is characterized in that the image data is superimposed on the memory (step 2) and image data conversion is performed on the superimposed image data (step 3).

[Operation] Using the timing of command / response (transmission / reception signal transmission / reception) on the transmitting side and the receiving side, text data is converted into image data in advance. As a result, since the text data is already converted into the image data when the actual image data is transmitted, the image data can be transmitted in real time.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 2 is an operation explanatory diagram of the present invention. First, it is assumed that the one-page coded image 10A stores coded image data before conversion. This encoded image 10
Consider overlaying text data on A and converting it to a coded image suitable for the receiver.

The one-page encoded image 10A is decoded (),
It is stored in the one-page decoded image 10B. On the other hand, TEXT
The data 11 is converted into font data (dot data) and is overlaid on the one-page decoded image 10B (). The conversion from the 1-page coded image 10A to the 1-page decoded image 10B and the overlay of the 1-page decoded image 10B of the TEXT data converted to dot data are performed at the command / response timing of the transmission side and the reception side. Use and go.

In this way, the one-page decoded image 10B in which the TEXT data is overlaid on the image data is converted into a code suitable for the receiving side (), and a one-page coded image (after conversion) 10C is obtained. The contents of the one-page coded image 10C are read line by line and transmitted to the receiving side.

FIG. 3 is a diagram showing a data conversion start processing timing according to the present invention. First, DIS from the receiver to the sender
(Identification signal) is transmitted (). The sender is using this DIS
Upon receipt of, the capability of the terminal of the transmission destination is confirmed, so that the necessity / unnecessity of the data is known. Therefore, the transmitting side starts the data conversion process for one page of the facsimile (S1).

Then, the transmission side sends DCS (reception command signal) to the reception side (). In addition, the sender will send TCF to the receiver.
(Training check signal) is sent (). Upon receiving this TCF, the receiving side returns a CFR (reception preparation confirmation signal) to the transmitting side ().

Upon receiving the CFR, the transmitting side confirms whether the conversion process is completed (S2). It takes about 6 seconds from the start of data conversion to the confirmation of the completion of conversion. And
Check if data conversion is completed (S
3). If it is not completed, the completion of the communication timer is waited until it is completed (up to 6 seconds after the CFR signal is received) until completion, and data transmission is started at the time of completion of processing (S4). Then, the converted image data is sent from the transmitting side to the receiving side ().

As described above, according to the present invention, the timing (about 6 seconds, maximum 12 seconds) from the time when the transmitting side receives the DIS signal until the time when the receiving side transmits the CFR signal is used and TEXT
If the overlay of the data to the image data and the data conversion processing are finished, the conversion is completed at the time of sending the image data in the communication procedure (), so that the data can be transferred in real time.

If the image data has multiple pages, the conversion process is started when the previous one-page transmission is completed and completed within the time required for the next-page transmission procedure signal transmission / reception. Can be completed. Therefore, when the text data is overlaid, the capability of the communication destination terminal does not match, and data conversion is necessary, it is possible to change and transmit the data in real time during communication.

FIG. 4 is a block diagram showing an embodiment of the transmitting side for implementing the present invention. In the figure, the broken line shows the operation of the transmission request image data, the thin solid line shows the operation of the TEXT code data, and the thick solid line shows the operation of the overlaid image data. In the figure, 20 is a host computer, 21 is an internal bus, 30 is an image storage / transmission adapter for communication processing, and 22 is a line.

In the image storage / transmission adapter 30, 31 is a host interface unit for interfacing with the host computer 20, 32 is an interface memory for receiving transmission request image data / text code data of overlay destination information from the host computer 20, and 33 is an overlay. This is a character font extraction unit that converts TEXT code data into dot images (for example, 24 × 24 dots) character by character.

34 holds the decrypted image data,
Decoded image dedicated memory that takes the logical sum of the overlay data converted to images by the character font extraction unit 33, 35 is an image decoding / encoding conversion unit that performs image decoding / encoding, and 36 is encoded A coded image dedicated memory for holding the image, 37 is a line control unit connected to the line 22.

The character font extracting unit 33 has a function corresponding to that shown in FIG. 2, and the decrypted image dedicated memory 33 is the same as that shown in FIG.
The data shown by the page decoding image 10B is held. The image decoding / coding conversion unit 35 is shown in FIG.
The coded image dedicated memory 36 holds the image data shown by 10A in FIG. 2 or the image data shown by 10C after data conversion. The operation of the circuit thus configured will be described below.

The encoded image data transferred from the host computer 20 to the interface memory 32 is stored in the encoded image dedicated memory 36. The encoded image data stored in the encoded image dedicated memory 36 is expanded into an image decoded by the image decoding / encoding conversion unit 35, and stored in the decoded image dedicated memory 34.

On the other hand, the host computer in the interface memory 32
The TEXT data transferred from 20 is expanded into image data for each character by the character font extracting unit 33, and stored in the decoded image dedicated memory 34. In this way, the logical sum of the image data decoded by the image decoding / encoding conversion unit 35 and the output data of the character font extraction unit 33 is obtained. As a result, the character image data is overlaid on the image data in the decoded image dedicated memory 34.

The decoded image data stored in the memory 34 for exclusive use of the decoded image is read by the image decoding / encoding conversion unit 35, encoded into a data format suitable for the format of the transmission destination (reception side) terminal, Encoded image dedicated memory 36
Stored in. The encoded data stored in the encoded image dedicated memory 36 is read line by line,
Sent to.

[Effects of the Invention] As described above in detail, according to the present invention, text data is converted into image data in advance by utilizing command / response (transmission procedure signal transmission / reception) timings on the transmitting side and the receiving side. Since the text data is already converted into the image data when the actual image data is transmitted, the real-time image data conversion and transmission can be performed.

[Brief description of drawings]

FIG. 1 is a flow chart showing the principle of the method of the present invention, FIG. 2 is an operation explanatory diagram of the present invention, FIG. 3 is a diagram showing a data conversion processing start timing according to the present invention, and FIG. 4 is a transmission for carrying out the present invention. FIG. 5 is a block diagram showing an embodiment of the conventional data conversion method, FIG. 5 is an explanatory diagram of a conventional data conversion method, and FIG. 6 is a diagram showing a conventional data conversion processing start timing. In FIG. 4, 20 is a host computer, 21 is an internal bus, 22 is a line, 30 is an image storing / transmitting adapter, 31 is a host interface section, 32 is an interface memory, 33 is a character font extracting section, and 34 is a decoded image only. Reference numeral 35 is a memory, 35 is an image decoding / coding conversion unit, 36 is a coded image dedicated memory, and 37 is a line control unit.

Claims (1)

(57) [Claims] 1. When data is transferred by adding text data to image data, an image memory for storing one page of image data and a character font table for converting text data into dot data are prepared (step 1), 1-page encoded image data is decoded and stored in the image memory by using command / response timings of the transmitting side and the receiving side, and text data is converted into dot data by a character font table. An image data conversion method characterized in that the image data is superposed on an image memory (step 2), and image data conversion is performed on the superposed image data (step 3).